Re: [quicwg/base-drafts] HTTP/3 references QUIC Stream IDs directly, allowing illegal references (#3273)

[Martin Thomson <[e-mail]>]

There is I think an additional assumption here: that stream IDs are allocated in ascending order.  More or less.  That isn't a hard requirement, but it informs how effective GOAWAY is.

```
global varint max_request_stream_id = 0;

on handling(request):
    max_request_stream_id = max(max_request_stream_id, request.stream_id)

on sending(goaway):
    goaway.stream_id = max_request_stream_id
    for r in open requests:
        if r.stream_id < max_request_stream_id:
            r.reset()
```

See, not especially complicated, but the extent to which you have to reset streams depends on the order in which stream IDs are allocated.

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